Heating-furnace.



J. A. SWINDELL.

HEATING FURNACE.

APPLICATION FILED JUNE 12, 1913.

Patented Apr; 28, 1914.

2 SHEETS-SHEET 1.

INVENTOR Wd/ZOZW COLUMBIA PLANOGRAPH c0, WASHINGTON, D. c=

J. A. SWINDELL.

HEATING FURNACE.

APPLICATION FILED JUNE 12, 1913.

1,094,61 1 Patented Apr. 28, 1914.

2 SHEETSSHEET 2.

COLUMBIA PLANOORAPH C0.,wAsmNa'r0N u c UNITED STATES PATENT OFFICE.

JOHN ALBERT SWINDELL, OF PITTSBURGH, PENNSYLVANIA.

HEATING-FURNACE.

rooacii.

To all whom. it may concern:

Be it known that I, J OHN ALBERT SWIN- nnnn, a citizen of the UnitedStates, residing at Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Heating-Furnaces, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification, in which Figure 1 is a horizontal section ofa heating furnace embodying my invention, the various fines being shownin dotted lines; and Figs. 2 and 3 are sections on the lines 11-11 andIIIIII respectively of Fig. 1.

My invention has relation to heating furnaces, for heating billets,blooms, ingots, etc., and is designed to provide a furnace of thischaracter having means for preheating the billets or blooms to anydesired degree before they are delivered into the main heating chamber.

The nature of my invention will be best understood by reference to theaccompanying drawings, in which I have shown a preferred embodimentthereof, it being premised, however, that my invention is applicable toother types of furnaces than the particular furnace shown, and that thedetails of construction and arrangement may be varied without departingfrom the spirit and scope of my invention as defined in the appendedclaims.

In these drawings, the numeral 2 designates the main heating chamber ofa heating furnace. This furnace is shown as being of the reversingregenerative type, although my invention is not limited thereto.

In accordance with my invention, I provide the furnace at one side withan extension 3, which incloses a preheating chamber 4:. This preheatingchamber has its floor 5 at substantially the same horizontal level asthe floor 6 of the main heating chamber 2, the chamber 4 being open atits inner end where it communicates with the chamber 2.

7 designates suitable doors in the side walls of the extension, and 8are other doors in the outer end wall thereof.

Formed below the chamber 4: is a transverse flue 9, which communicateswith opposite sides of the chamber 4 at the outer corner portionsthereof by means of the vertical flues 10. The flue 9 has a stack flueconnection 11, which preferably communicates with the regular stack fine12 below Specification of Letters Patent.

Application filed June 12, 1913.

Patented Apr. 28, 1914.

Serial No. 773,260.

the furnace reversing valves 13. The flue connection 11 is provided witha suitable regulating damper 11 By properly adj usting this damper 11any desired amount of the products of combustion may be drawn off fromthe chamber 2- and into and through the preheating chamber at.

The billets, blooms, or other metal articles to be heated are introducedinto the chamber 4. where they are preheated to the desired degreebefore being moved into the main heating chamber 2. In this manner theblooms or billets may be gradually brought up to the desired heat. Inthe construction as shown, the blooms or billets are moved in thechamber 4, and from the chamber at into the main chamber 2, manually bymeans of suitable bars introduced through the door openings at 7 and 8.It will be understood, however, that I may employ any suitable feedingmeans in connection with my improved furnace, the latter, however,forming no part of my present invention.

My invention enables the main heating chamber of the furnace to be keptat an approximately uniform working heat. The preheating being done inthe auxiliary chamber, it is unnecessary to slow down the main chamberduring the preliminary heating. This enables the furnace to be workedmuch more economically. My improved furnace is also especially adaptedto heating special steels, such as high-alloy or other steels whichrequire to be heated slowly during the initial portion of the heatingoperation.

My invention is applicable to various types of furnaces in which theproducts of combustion pass through the main heating chamber atsubstantially right angles to the movement of the billets therethrough.

What I claim is 1. A blank heating furnace comprising a main heatingchamber, flues for causing a heat circulation longitudinally of saidchamber from end to end in either direction, said fines havingconnection with a stack, a preheating chamber oflset laterally from themain heating chamber at one side thereof, said preheating chamber beingopen at its inner side for at least the major portion of the width ofthe chamber, and for a distance greater than the length of the blank tobe heated, said preliminary heat ing chamber having a controllable flueleading therefrom to the said stack, and forming means whereby apositively controlled heat circulation may be obtained from the mainchamber through the preheating chamber; substantially as described.

A blank heating furnace comprising a main heating chamber, reversibleregenerator connections communicating with opposite ends of said mainchamber and forming means for-causing a heat circulation longitudinallyin either direction, a stack with which the said connections are tocommunicate, a preheating chamber offset laterally from the main heatingchamber at one side thereof, said preliminary chamber being open to themain heating chamber at its in ner end for at least the major portion ofthe width of the preliminary chamber and for a distance greater than thelength of the blanks to be heated, said preliminary heating chamberhaving a controllable flue leading therefrom to the said stack, andforming means whereby a positively controlled heat circulation may beobtained from the main chamber through the preheating chamber;substantially as described.

3. A blank heating furnace comprising a main heating chamber, means forcausing a heat circulation longitudinally of said chamber in eitherdirection, a preheating chamber ofii'set laterally from the main chamberand communicating therewith at its inner end, said preheating chamberhaving an olftake fine at each of its outer corner portions, saidolftake fines being connected to the stack which provides for the draftthrough the main heating chamber; substantially as described.

In testimony whereof, I have hereunto set my hand.

JOHN ALBERT SWINDELL. Witnesses:

G110. H. PARMELEE, H. M. CORWIN.

Copies 0! this patent may be obtained for five cents each, by addrexsmgthe Commissioner 02 Eatents. Washington, D. G.

